When a change in the dates of a task violates a dependency, the relevant dependency is colored in red in the Gantt chart.
(For example, I have a FS dependency, and I manually rescheduled the 2nd task to begin before the end of the 1st task)
However, we are not always using a view that shows all predecessors, and we can miss the influence of such a change.
It would be helpful to have a pop-up message indicating that a dependency has been violated, and maybe also some color indication of the task itself.